http://www.diyaudio.com/forums/vendors-bazaar/180625-irs2092-iraudamp7s-irfi4019.html
L15D is suitable for the voltage. Recommend + -50V DC voltage.
If the switch power supply board power and transformer + filter capacitor, equal to the price, so I will choose the transformer and filter capacitor.
Hi Rens, what did you do to get that low end ? My L15D Pro's sounded quite flat when I first ran them. But after a couple of days they seem to have gotten better in the low end although I would like them to be a bit more punchy. Is there an easy tweak to achieve that ? I am using a 45v/300w SMPS from Connex.
Thxs
R
Hi LJM, do you supply a upgrade kit with the new components for the L15D Pro ? What difference do the new components make to the sound quality ? Thank's.
Greetings
R
I changed the standard 220uF/63V rail buffers with 820uF/63V Panasonic Low ESR ones ( RS 571521 ) they fit on the board and this is audible as a tighter Bass .The standard input caps were changed by Elna SilmicII 22uF/63V . At first I was disappointed by this mod , found the sound a bit dull , but after a couple of hours the sound opened up and after a week or so it sounded much better as the originals .I also added 10.000uF/63V capacitors to each rail at the PSU ( that's for 5 amps in my case , so 3300uF or 4700uF will do for 2 amps or you might trip the overcurrent protection on the Connex SMPS )
Cheers ,
Rens
I'm sorry I have no way to provide a package for the previous products, upgrade.
And once the product does not appear any defects. But now the capacitor after the upgrade, the performance is improved.
To reduce the distortion of capacitor, capacitor temperature decrease, increase the service life of the capacitor.
LJM,
Are you using these polymer caps on your L20D amps now? I am thinking of getting a pair from you TB store.
Regards,
I have never sold a red board products. All red for the fake and shoddy.
I use the circuit board are all military enterprises production, gold plating process.
All the components are the need for strict testing, the selection of the best performance products.
Ok, I understand, no problem. Do you have a time frame for the new version ? Thank's very much.
PS. I have a L15D Pro. Can I replace the default capacitors with the OSCON ones as in the picture below ?
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Thank's Rens. I'm glad you have also experienced the "opening up" over time of the this amp. I thought I was hearing things but the SQ definitely did change (to the better ). So, I am really happy with the sound at the moment even without any mods. But am looking forward to doing some anyways
Hi LJM,
Sorry for being such a noob but I cannot find the exact blue version of this capacitor, can I use an alternative OS-CON capacitor like this one ?
Thank's
Of course you can. Polymer semiconductor solid capacitors extremely well.
25V22UF or 33UF
ljm : if you build new boards, you should consider leave more space for the power capacitors. Just moving a few components would be sufficient.
ps: success is when people copy you. You are successfull
Larger capacitors. You can consider the use of Cans capacitor?
They look really quite spectacular.
I have spent couple of hours to read this thread but haven't found the answer for my question. Here it is: I have a transformer and a PS board from an old amp supplying +-50V and am thinking about using 2xL15D bridged to build an instrument amplifier for my bass.
Can anyone tell me is it something I can do using the boards of ljm_ljm? I mean without external parts for reverse phase input of the 2nd half of the bridge.
THX
Can anyone tell me is it something I can do using the boards of ljm_ljm? I mean without external parts for reverse phase input of the 2nd half of the bridge.
THX
You need a phase inverter for one of the amps .
see my post : http://www.diyaudio.com/forums/clas...-irs2092-irfi4020h-200w8r-38.html#post2951879
Cheers ,
Rens
Many thanks Rens, very useful post.
Any experience using such amp for bass? I am hoping the sound quality (especially for the low end) is good enough.
I would put the amp and ps in my 1x15 cabinet to avoid carrying the amp as an another "box" and would feed it from an external preamp on my pedal board.
Should I go for the Pro version with the speaker protection or the v3 is good enough for this?
Thanks
Any experience using such amp for bass? I am hoping the sound quality (especially for the low end) is good enough.
I would put the amp and ps in my 1x15 cabinet to avoid carrying the amp as an another "box" and would feed it from an external preamp on my pedal board.
Should I go for the Pro version with the speaker protection or the v3 is good enough for this?
Thanks
No experience for bass only , I use them full range with 15" Tannoy's and the bass is impressive !
I would go for the Pro version because the build in DC protection and the 2 separate FET's. vs one dual FET in the L15D. The L15D has no protection
Make sure you use at least 10.000uF capacitors per rail .
Cheers ,
Rens
Thanks Rens. I've just ordered an assembled pair (pro) on ebay from china.
Hope I got it soon and if everything goes well with the installation I am going to report my impressions.
Cheers
